/* ============================================================
   越境実験室 EKKYO LAB — style.css
   Black / White / Gray + one accent of Yellow.
   Editorial, quiet, magazine-like. No noise, no gimmicks.
   ============================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body, h1, h2, h3, h4, p, figure, blockquote, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, textarea { font: inherit; }

/* ---------- Design tokens ---------- */
:root {
  --black: #121212;
  --white: #FAF9F6;
  --gray-900: #2b2b28;
  --gray-600: #6f6d66;
  --gray-400: #9d9b93;
  --gray-200: #e3e0d7;
  --gray-100: #efece4;
  --yellow: #FFE600;
  --line: rgba(18, 18, 18, 0.14);
  --line-on-black: rgba(250, 249, 246, 0.2);

  --font-sans: "Zen Kaku Gothic New", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --container: 1180px;
  --edge: clamp(20px, 5vw, 64px);
  --ease: cubic-bezier(.16,.84,.32,1);
}

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

body {
  background: var(--white);
  color: var(--black);
  font-family: var(--font-sans);
  font-feature-settings: "palt";
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--gray-200); color: var(--black); }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--black); color: var(--white);
  padding: 12px 20px; font-weight: 700; z-index: 999;
}
.skip-link:focus { left: var(--edge); top: var(--edge); }

:focus-visible { outline: 2px solid var(--black); outline-offset: 3px; }

.container { max-width: var(--container); margin-inline: auto; padding-inline: var(--edge); }

/* photography: keep it monochrome so yellow stays the only color accent */
.photo img { filter: grayscale(1) contrast(1.04); }

/* ---------- Section scaffolding ---------- */
section { position: relative; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 30px;
  margin-bottom: clamp(30px, 5vw, 56px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--black);
}
/* Section headings (NEWS/PROJECT/ARCHIVE/MEMBER/COMPANY) only — 4 steps larger than the base .eyebrow size (2 + 2 more). Does not affect the global nav or the "COMING SOON" labels, which don't sit inside .section-head. */
.section-head .eyebrow { font-size: 20px; }
.section-note {
  color: var(--gray-600);
  font-size: 0.92rem;
  max-width: 42ch;
}

.quiet-link {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-bottom: 1px solid var(--black);
  padding-bottom: 2px;
  white-space: nowrap;
  transition: border-color .2s var(--ease);
}
.quiet-link:hover { border-color: var(--yellow); }
.quiet-link .arrow { transition: transform .2s var(--ease); display: inline-block; }
.quiet-link:hover .arrow { transform: translateX(3px); }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 20px var(--edge);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background .3s var(--ease), border-color .3s var(--ease), padding .3s var(--ease);
  border-bottom: 1px solid transparent;
  mix-blend-mode: normal;
}
.site-header.is-scrolled {
  background: rgba(250, 249, 246, 0.94);
  backdrop-filter: blur(8px);
  border-bottom-color: var(--line);
  padding-block: 14px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.01em;
  z-index: 2;
}
.brand img { height: 32px; width: auto; display: block; }

.nav-desktop { display: none; }
.nav-desktop ul { display: flex; align-items: center; gap: clamp(20px, 2.6vw, 40px); }
.nav-desktop a {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 6px 1px;
  position: relative;
}
.nav-desktop a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 2px; background: var(--yellow);
  transition: right .25s var(--ease);
}
.nav-desktop a:hover::after, .nav-desktop a.is-active::after { right: 0; }

.nav-toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 36px; height: 36px; z-index: 210; position: relative;
}
.nav-toggle span { display: block; height: 1.5px; width: 100%; background: var(--black); transition: transform .3s var(--ease), opacity .3s var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav-mobile {
  position: fixed; inset: 0; background: var(--black); color: var(--white);
  z-index: 200; display: flex; flex-direction: column; justify-content: center;
  padding: 100px var(--edge) 60px;
  transform: translateY(-100%);
  transition: transform .45s var(--ease);
}
.nav-mobile.is-open { transform: translateY(0); }
.nav-mobile ul { display: flex; flex-direction: column; }
.nav-mobile a {
  font-family: var(--font-sans);
  font-size: clamp(2rem, 11vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-on-black);
  display: block;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 88svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: 104px;
  padding-bottom: clamp(24px, 4vw, 42px);
  overflow: hidden;
}
.hero-inner { position: relative; z-index: 2; text-align: center; }
.hero-title {
  font-family: var(--font-sans);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 0.98;
  color: var(--black);
  font-size: clamp(2.6rem, 10.5vw, 7.4rem);
}
.hero-subtitle {
  margin-top: clamp(24px, 4vw, 40px);
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.55;
  color: var(--black);
  font-size: clamp(1.1rem, 2.8vw, 1.6rem);
  white-space: nowrap;
}
.hero-message {
  margin-top: clamp(18px, 4vw, 36px);
  margin-inline: auto;
  max-width: 40em;
  color: var(--gray-600);
  font-weight: 400;
  font-size: clamp(0.68rem, 2.8vw, 0.94rem);
  line-height: 1.6;
  white-space: normal;
}

/* ============================================================
   Reveal
   ============================================================ */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > * { transition-delay: calc(var(--i, 0) * 70ms); }

/* ============================================================
   MEMBER
   ============================================================ */
.member { padding-block: clamp(70px, 10vw, 120px); }
.member-grid {
  display: grid;
  grid-template-columns: 1fr;
}
.member-card {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: clamp(20px, 4vw, 40px);
  align-items: center;
  padding-block: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--line);
}
.member-grid > .member-card:first-child { border-top: none; }
.member-photo { aspect-ratio: 1/1; overflow: hidden; background: var(--gray-100); max-width: 220px; }
.member-photo img { width: 100%; height: 100%; object-fit: cover; }
.member-role {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gray-600);
  text-transform: uppercase;
}
.member-role + .member-role { margin-top: 3px; }
.member-name { font-family: var(--font-sans); font-size: clamp(1.2rem, 2.2vw, 1.5rem); font-weight: 500; letter-spacing: -0.01em; margin-top: 6px; }
.member-bio { color: var(--gray-600); font-size: 0.9rem; margin-top: 10px; max-width: 62ch; }

/* ============================================================
   NEWS
   ============================================================ */
.news { padding-block: clamp(60px, 9vw, 100px); }
.news-index { border-top: 1px solid var(--line); }
.news-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 8px 22px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 90px;
}
.news-row time { font-family: var(--font-mono); font-size: 12.5px; color: var(--gray-600); }
.news-row p { font-size: 0.9rem; }
.news-row p a { color: inherit; border-bottom: 1px solid transparent; transition: border-color .2s var(--ease); }
.news-row p a:hover { border-color: var(--yellow); }

/* ============================================================
   PROJECT
   ============================================================ */
.project { padding-block: clamp(70px, 10vw, 120px); }
.project-grid { display: grid; grid-template-columns: 1fr; gap: clamp(40px, 6vw, 30px); }
.project-card { display: grid; gap: 16px; }
.project-photo-link { display: block; }
.project-photo { position: relative; aspect-ratio: 1/1; overflow: hidden; background: var(--gray-100); }
.project-photo img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.project-card:hover .project-photo img { transform: scale(1.03); }
.coming-soon-overlay {
  position: absolute;
  inset: 0;
  background: rgba(18, 18, 18, 0.45);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.project-name { font-family: var(--font-sans); font-size: clamp(1.25rem, 2.4vw, 1.55rem); font-weight: 500; letter-spacing: -0.01em; }
.project-desc { color: var(--gray-600); font-size: 0.92rem; }

/* ============================================================
   ARCHIVE
   ============================================================ */
.archive { padding-block: clamp(70px, 10vw, 120px); border-top: 1px solid var(--line); }
.archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: clamp(24px, 3vw, 32px);
}
.archive-photo-link { display: block; }
.archive-photo { aspect-ratio: 3/2; overflow: hidden; background: var(--gray-100); border: 1px solid var(--line); }
.archive-photo img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.archive-photo-link:hover .archive-photo img, .archive-photo-link:focus-visible .archive-photo img { transform: scale(1.03); }
.archive-date { font-family: var(--font-mono); font-size: 11px; color: var(--gray-600); margin-top: 14px; }
.archive-title { font-weight: 500; font-size: 0.98rem; margin-top: 4px; letter-spacing: -0.01em; }
.archive-desc { color: var(--gray-600); font-size: 0.85rem; margin-top: 6px; }
.archive-desc a { color: var(--black); border-bottom: 1px solid var(--black); }

/* ============================================================
   COMPANY
   ============================================================ */
.company { padding-block: clamp(60px, 9vw, 100px); }
.company-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 8px 22px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.company-row dt { font-family: var(--font-mono); font-size: 12.5px; color: var(--gray-600); }
.company-row dd { font-size: 0.98rem; margin: 0; }
.company-row dd a { color: var(--black); border-bottom: 1px solid var(--black); }
.company-members { display: flex; flex-wrap: wrap; gap: 8px 28px; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { background: #000; color: var(--white); padding: 36px var(--edge) 28px; border-top: 1px solid var(--line); }
.footer-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px; padding-bottom: 20px; }
.footer-top .brand img { filter: brightness(0) invert(1); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-nav a { font-size: 12px; letter-spacing: 0.04em; color: rgba(255, 255, 255, 0.7); }
.footer-nav a:hover { color: var(--white); }
.footer-bottom { padding-top: 18px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 20px; font-family: var(--font-mono); font-size: 11px; color: rgba(255, 255, 255, 0.55); }

/* ============================================================
   NEWS LIST PAGE / PROJECT SUB PAGES / PRIVACY (shared)
   ============================================================ */
.page-hero { padding: 150px var(--edge) 56px; border-bottom: 1px solid var(--line); }
.page-hero .container { max-width: var(--container); }
.page-hero h1 { font-family: var(--font-sans); font-size: clamp(2rem, 5.5vw, 3.4rem); font-weight: 800; letter-spacing: -0.01em; }
.page-hero p { margin-top: 14px; color: var(--gray-600); max-width: 50ch; }
.breadcrumb { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em; color: var(--gray-600); margin-bottom: 18px; display: inline-flex; gap: 8px; }

.news-full { padding-block: clamp(46px, 8vw, 80px); }
.news-filter { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 30px; }
.filter-chip { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em; padding: 7px 12px; border: 1px solid var(--line); background: transparent; color: var(--gray-600); transition: background .2s, color .2s, border-color .2s; }
.filter-chip.is-active, .filter-chip:hover { background: var(--black); color: var(--white); border-color: var(--black); }

.coming-soon { padding-block: clamp(60px, 10vw, 110px); }
.coming-soon-box { border-top: 1px solid var(--black); padding-top: clamp(24px, 4vw, 40px); display: grid; gap: 20px; max-width: 640px; }
.coming-soon-box h2 { font-family: var(--font-sans); font-size: clamp(1.3rem, 3vw, 1.9rem); font-weight: 800; letter-spacing: -0.01em; }
.coming-soon-box p { color: var(--gray-600); max-width: 56ch; }
.coming-soon-list { display: grid; gap: 9px; margin-top: 4px; }
.coming-soon-list li { font-size: 0.86rem; color: var(--gray-600); padding-left: 16px; position: relative; }
.coming-soon-list li::before { content: "—"; position: absolute; left: 0; color: var(--gray-400); }

.policy { padding-block: clamp(50px, 8vw, 90px); }
.policy .container { max-width: 720px; display: grid; gap: 26px; }
.policy h2 { font-family: var(--font-sans); font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.policy p { color: var(--gray-600); font-size: 0.95rem; line-height: 1.9; }
.policy a { color: var(--black); border-bottom: 1px solid var(--black); }

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Smartphone-only overrides. Desktop/tablet rules above are untouched. */
@media (max-width: 639.98px) {
  .hero { min-height: 46svh; padding-top: 104px; padding-bottom: clamp(16px, 3vw, 28px); }
  .hero-message { font-size: 0.92rem; }
  .member-card { grid-template-columns: 1fr 1.5fr; }
}

@media (min-width: 640px) {
  .project-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 760px) {
  .footer-bottom { flex-wrap: nowrap; }
}

@media (min-width: 860px) {
  .nav-desktop { display: block; }
  .nav-toggle { display: none; }
  .news-row { grid-template-columns: 130px 1fr; }
  .company-row { grid-template-columns: 130px 1fr; }
}